Graphite Thermal Conduction Layer for Backlight Heat Dissipation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing heat dissipation methods using aluminum substrates in liquid crystal display devices are inefficient, leading to high temperatures and severe light attenuation in light sources, which shortens their service life and affects the overall product quality.
Innovation Solution
A backlight module incorporating a graphite thermal conduction layer with high thermal conductivity, arranged on one side of the substrate, which includes via-holes at the bottom of the back plate to enhance heat dissipation, and can be coated or adhered onto the substrate, improving heat dissipation efficiency by aligning with hot gas flow directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an aluminum substrate is used to dissipate heat from the light source, then the heat dissipation structure is simple and easy to manufacture, but the heat dissipation efficiency is insufficient leading to high temperatures and light attenuation
Solution Approach 1:
The patent combines aluminum substrate with graphite thermal conduction layer to create a composite heat dissipation structure. The graphite layer is coated on the aluminum substrate to form a composite material that leverages the high thermal conductivity of graphite (up to 1000 w/mk in horizontal direction) while maintaining the structural benefits of aluminum, thereby significantly improving heat dissipation efficiency and preventing light attenuation
Solution Approach 2:
The patent changes the thermal conductivity parameter of the heat dissipation structure by introducing graphite material with extremely high thermal conductivity. This parameter change enables the heat dissipation structure to efficiently conduct heat away from the light source in the horizontal direction, resolving the issue of insufficient heat dissipation while maintaining manufacturing feasibility
2Device complexity
If an aluminum substrate is used to dissipate heat, then the structure is simple, but the heat dissipation efficiency deteriorates over long-term use causing light attenuation
Solution Approach 1:
The composite structure of aluminum substrate plus graphite thermal conduction layer provides enhanced and stable heat dissipation performance over long-term use. The graphite layer maintains consistent thermal conductivity, ensuring stable brightness of the light source without the deterioration seen in simple aluminum substrate designs
3Reliability
If a graphite thermal conduction layer is added to the substrate, then the heat dissipation efficiency is significantly improved, but the device complexity increases
Solution Approach 1:
The graphite thermal conduction layer is applied as a thin film or coating on the aluminum substrate. This thin-film approach provides the high thermal conductivity benefits of graphite while minimizing the increase in device complexity and maintaining a compact structure
Solution Approach 2:
The composite material design integrates the graphite layer with the aluminum substrate in a unified structure, where the two materials work together synergistically. This integration reduces the need for separate components and simplifies the overall device architecture despite the enhanced functionality
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of a graphite thermal conduction layer significantly enhances heat dissipation efficiency, preventing light attenuation and prolonging the service life of the light source by effectively managing heat generated within the device.
Implementation Method 1
the graphite thermal conduction layer has thermal conductivity up to 1000 w/mk in a horizontal direction. The graphite thermal conduction layer may be arranged, and used to dissipate the heat, in a direction identical to a hot gas flow direction
Data Source
Figure 1~2
Figure 3
AI summary
The present disclosure provides a backlight module and a display device. The backlight module includes a substrate, a plurality of light sources arranged at one side of the substrate, and a graphite thermal conduction layer arranged at the other side of the substrate.